US2154668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for separating ethylene from a gaseous mixture with ethane, methane, and hydrogen
Assignee: Individual
•
Filing: 1936-01-09
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Granted: 1939-04-18
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Expires: 1956-01-09
Abstract
No abstract record available.
Inventors
- 👤 Baufre William Lane De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:04
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; C; C07; C07C; C07C7/00; C07C7/04; F25J2210/00; F25J2210/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |